Solving a Conjugate Heat Transfer Problem using Ansys Fluent

Solving a Conjugate Heat Transfer Problem using Ansys Fluent

The contemporary conjugate heat transfer model was developed after computers came into wide use in order to substitute the empirical relation of proportionality of heat flux to temperature difference with heat transfer coefficient which was the only tool in theoretical heat convection since the times of Newton. This model, based on a strictly mathematically-stated problem, describes the heat transfer between a body and a fluid flowing over or inside it as a result of the interaction of two objects. The physical processes and solutions of the governing equations are considered separately for each object in two subdomains. Matching conditions for these solutions at the interface provide the distributions of temperature and heat flux along the body/flow interface, eliminating the need for a heat transfer coefficient. Moreover, it may be calculated using these data.

Conjugate heat transfer (CHT) refers to the coupling of conduction in solids with the convective and radiative heat transfer in the surrounding fluids. Accurately predicting CHT is an essential part of the design process in many industrial applications including electronics cooling, turbomachinery, and HVAC. With ANSYS CFD, the tools to perform high fidelity CHT analyses are at your fingertips.

You will learn how to do following through this tutorial:

  • Set up appropriate boundary conditions for a conjugate heat transfer simulation in ANSYS FLUENT
  • Enable source terms for specified zones
  • Perform flow and energy calculations using various materials (both solid and fluid)
  • Manipulate mesh adaption registers and perform Boolean operations on them
  • Perform mesh adaption and verify that the solution is mesh independent

Problem Description

The figure includes a series of heat-generating electronic chips installed on a circuit board. Air flow limited between the circuit board and upper wall, cools the chips and the board.

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